31.Either you or on of your students________to attend the meeting that is due tomorrow.
—How can we _________ a large amount of fruit in the summer?—By freezing or bottling.
There's a strong possibility _________he'll get promoted. If so, let'scongratulate him.
_________ so busy, she would come to help you.
Without the air to hold some of the sun's heat, the earth at night _________,too cold for us to live.
_________his teacher, Li Ming wouldn't have passed the Englishexam so easily.